Elemental stoichiometry (C, N, P) of soil in the Yellow River Delta nature reserve: Understanding N and P status of soil in the coastal estuary

Meng, Lingheng; Qu, Fanzhu; Bi, Xiaoli; Xia, Jiangbao; Li, Yunzhao; Wang, Xuehong; Yu, Junbao

doi:10.1016/j.scitotenv.2020.141737

Cited by 20 publications

(9 citation statements)

References 63 publications

(98 reference statements)

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“…To ensure the uniform distribution of sampling points, we placed cards on the ground at 30 m intervals within each plot. A total of 108 sample points were established, including 36, 32, and 40 points in Plots A, B, and C, respectively [ 37 ].…”

Section: Methodsmentioning

confidence: 99%

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Sun

Jiang

et al. 2022

Sensors

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Rapid and large-scale estimation of soil salt content (SSC) and organic matter (SOM) using multi-source remote sensing is of great significance for the real-time monitoring of arable land quality. In this study, we simultaneously predicted SSC and SOM on arable land in the Yellow River Delta (YRD), based on ground measurement data, unmanned aerial vehicle (UAV) hyperspectral imagery, and Landsat-8 multispectral imagery. The reflectance averaging method was used to resample UAV hyperspectra to simulate the Landsat-8 OLI data (referred to as fitted multispectra). Correlation analyses and the multiple regression method were used to construct SSC and SOM hyperspectral/fitted multispectral estimation models. Then, the best SSC and SOM fitted multispectral estimation models based on UAV images were applied to a reflectance-corrected Landsat-8 image, and SSC and SOM distributions were obtained for the YRD. The estimation results revealed that moderately salinized arable land accounted for the largest proportion of area in the YRD (48.44%), with the SOM of most arable land (60.31%) at medium or lower levels. A significant negative spatial correlation was detected between SSC and SOM in most regions. This study integrates the advantages of UAV hyperspectral and satellite multispectral data, thereby realizing rapid and accurate estimation of SSC and SOM for a large-scale area, which is of great significance for the targeted improvement of arable land in the YRD.

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Section: Methodsmentioning

confidence: 99%

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Sun

Jiang

et al. 2022

Sensors

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“…Low nutrient content and high salinity are two major characteristics of coastal wetland soil, leading to a high vulnerability of the ecosystem (Jia et al, 2017;Li et al, 2021b). As the primary soil nutrient elements, carbon (C), nitrogen (N), and phosphorus (P) are the basis for the composition of all living substances in the ecosystem (Qu et al, 2014;Meng et al, 2021). C constitutes the fundamental structure of plants and accounts for their biomass far beyond 50% (Xu et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…To support our results, Du(Du et al, 2022) found that the C/N/P of each sampling site was high in the surface soils with plant root disturbance and decreased with depth based on137 Cs dating technology in the study area. The values of the CK group were much lower than the optimal C/N value(25) for soil organic matter decomposition(Ye et al, 2018; Elizabeth et al, 2020), because the decomposition of soil organic matter was quick and the nutrient accumulation was low in the intertidal zone(Xu et al, 2019;Meng et al, 2021). The average N/P values in CK and RS groups were 0.88 and 1.24, respectively, and the obvious difference was only observed in Tc (p < 0.05) (Fig.3I).…”

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confidence: 99%

Root disturbance effects of diverse halophytes on soil nutrient elements and salt ions in intertidal ecotone of the Yellow River Estuary wetland

Sun,

Guan,

et al. 2023

Preprint

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Four representative halophytes of Tamarix chinensis (Tc), Phragmites australis (TPa), Suaeda salsa (Ss) and Spartina alterniflora (Sa) in the Yellow River Estuary wetland were selected to clarify the root disturbance effects on soil nutrient elements, salt ions and their stoichiometric ratios. The results showed that the average TOC content of Tc, TPa, Ss, and Sa in the rhizosphere (RS) group were 5.19, 2.15, 2.05, and 2.14 times of those in the non-rhizosphere (CK) group, respectively. TN content of Tc in the RS group was about 3.44 times of the CK group. The average soil pH and salinity reduced by 3.60% and 41.35%, respectively, due to the root disturbance of Tc. Soil ions including K+, Ca2+, Mg2+, Na+, Cl- and SO42- reduced by 33.86%-62.86%. The root disturbance of TPa reduced soil pH and salinity by 1.09% and 35.47%, respectively, and soil ions reduced by 16.93%-46.85%. However, the root disturbance effects in Sa and Ss were not obvious. The results of Mantel test and PCA demonstrated that the root disturbance diversified the soil characteristics. The disturbance of roots played a crustal role in affecting the spatial heterogeneity of soil properties in the coastal wetlands above the intertidal zone (Tc and TPa), and its effect was greatly weakened below the intertidal zone (Sa and Ss). These findings are important for understanding how halophytes can impact soil nutrient levels and salt concentrations in coastal wetlands, which is crucial for effective management and restoration efforts.

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“…Studies on soil nutrients were primarily focused on the single or multiple elements within a certain administrative division [9]. However, the spatial distribution of soil nutrient elements and the analysis of influencing factors of the administrative division have ignored the natural process of soil nutrient formation and cyclic accumulation to a certain extent [7].…”

Section: Introductionmentioning

confidence: 99%

Spatial Differentiation of Ecological Stoichiometry of Nitrogen and Phosphorus in Mollic Epipedon of China

2022

International Journal of Chemical Engineering

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Nitrogen (N) and phosphorus (P) are essential elements for crop growth. The study on the spatial differentiation characteristics of soil N and P can provide a theoretical basis for regional fertilization as well as prevention and control of agricultural surface pollution. Taking the typical mollic epipedon area in Northeast China as study area, using the geostatistical model and 3S technology (Remote Sensing, RS; Geography information systems, GIS; and Global positioning systems, GPS), the spatial variation and influencing factors of N and P ecological stoichiometry in the surface soil (0-20 cm) were studied with 1,057 samples by five-point soil sampling method. The outcomes of the study showed that the average total nitrogen (TN), total phosphorus (TP), and N/P ratio were 1.88 g/kg, 0.276 g/kg, and 6.81, respectively. The degree of spatial variation is moderate, and structural factors such as topography and soil parent material are the main factors affecting the spatial variation of soil TN, TP content, and N/P ratio. Vegetation primarily affects the soil TN, TP contents, and N/P specific spatial variation. Soil TN and TP contents showed a downward trend from the northeast to the southwest region of the study. Different approaches of balanced fertilization, soil and water conservation, and reasonable spatial allocation are beneficial to improving the balance of soil N and P in the typical mollic epipedon area of Northeast China.

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Elemental stoichiometry (C, N, P) of soil in the Yellow River Delta nature reserve: Understanding N and P status of soil in the coastal estuary

Cited by 20 publications

References 63 publications

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Estimation of Soil Salt Content and Organic Matter on Arable Land in the Yellow River Delta by Combining UAV Hyperspectral and Landsat-8 Multispectral Imagery

Root disturbance effects of diverse halophytes on soil nutrient elements and salt ions in intertidal ecotone of the Yellow River Estuary wetland

Spatial Differentiation of Ecological Stoichiometry of Nitrogen and Phosphorus in Mollic Epipedon of China

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